Lithium battery system

Abstract

The utility model discloses a lithium battery system, which relates to the field of circuit devices or systems for power supply or power distribution, and comprises a plurality of lithium cells and a support frame, the plurality of lithium cells are placed on the support frame, and anodes and cathodes of the plurality of lithium cells are respectively welded together to form a cell anode and a cell cathode; the partition plate is fixed at the top of the support frame, and the battery cell positive electrode and the battery cell negative electrode extend out from the upper end of the partition plate; the cover plate is positioned above the partition plate, and a positive pole and a negative pole are fixedly mounted on the cover plate; and the super capacitor bank is fixed on the partition plate, the positive pole of the super capacitor bank is connected with the battery positive pole, and the negative pole is connected with the battery negative pole. According to the utility model, the super capacitor bank is connected in parallel between the positive binding post and the negative binding post on the lithium battery, the super capacitor bank can charge and discharge along with the voltage fluctuation of the generator or during the power-off protection of the lithium battery to generate corresponding charge and discharge current, and at the moment, the current sensor of the storage battery of the vehicle can detect normal current.

Description

Technical Field

[0001] The utility model relates to the field of circuit devices or systems for power supply or distribution, and in particular to a lithium battery system. Background Art

[0002] Lithium batteries, which use lithium metal or lithium alloys as anode materials and non-aqueous electrolyte solutions, are increasingly being used in everyday life due to their excellent performance. They are widely used in electronic products such as computers and mobile phones, as well as in electric bicycles and electric vehicles. Lithium-ion batteries offer many advantages for starting vehicles, such as low self-discharge, long shelf life, and high instantaneous starting current. However, they also have disadvantages, such as the inability to charge below 0°C. Charging lithium-ion batteries at zero degrees Celsius increases the risk of lithium deposition in the battery cell. The formation of lithium dendrites occurs primarily when lithium ions migrate from the positive electrode to the negative electrode during charging, depositing and forming dendritic lithium metal on the negative electrode surface. This affects the battery's service life. At low temperatures, the risk of lithium deposition increases significantly, making the formation of lithium dendrites more likely.

[0003] When lithium batteries are used as starting power sources in cars, they are exposed to different influences due to the changing seasons and the different outdoor temperatures. This is especially true in winter when temperatures in central, northern, and northeastern China often drop below 0 degrees Celsius.

[0004] Moreover, most cars currently use lead-acid batteries as starting power sources. The charging temperature of lead-acid batteries is relatively wide and can still be charged normally in an environment of 0 degrees. When lithium batteries replace lead-acid batteries as the starting power source for cars, the impact of low temperature environments below 0 degrees on lithium batteries must be considered. Therefore, below 0 degrees, charging of lithium batteries is generally stopped to avoid lithium deposition in lithium batteries. However, current sensors are generally installed in cars (usually there is a current sensor on the negative pole of the vehicle) to monitor the current of the battery and transmit the data to the driving computer. Once the detected current is abnormal, the vehicle will display a battery fault.

[0005] When the high voltage status protection of the battery's BMS battery protection board is turned on or the lithium battery is stopped from charging below 0 degrees, it means that there is no current in the circuit. The current sensor detection value is low, and the vehicle will think that the battery is damaged, causing the battery fault light to be always on, which will give the owner the illusion that the battery is damaged. Utility Model Content

[0006] The purpose of the present utility model is to provide a lithium battery system to solve the technical problems raised in the above background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: a lithium battery system comprising:

[0008] A plurality of lithium battery cells and a support frame, wherein the plurality of lithium battery cells are placed on the support frame, and the positive and negative electrodes of the plurality of lithium battery cells are welded together to form a positive electrode and a negative electrode of the battery cell;

[0009] A separator is fixed on the top of the support frame, and the positive electrode and the negative electrode of the battery cell extend from the upper end of the separator;

[0010] A cover plate is located above the partition, and the positive and negative poles are fixedly mounted on the cover plate;

[0011] A supercapacitor group is fixed on the separator, with the positive electrode of the supercapacitor group connected to the positive column of the battery and the negative electrode connected to the negative column of the battery. When the charging of the lithium battery is turned off, the supercapacitor group will charge and discharge as the voltage of the generator fluctuates, generating normal charge and discharge current;

[0012] The BMS battery protection board is fixedly mounted on the upper end surface of the partition, the negative electrode of the battery cell is connected to the negative electrode of the BMS battery protection board, and the total negative electrode of the BMS battery protection board is connected to the negative electrode column of the cover plate.

[0013] Preferably, a heating control board is fixed on the separator, the positive electrode of the heating control board is connected to the positive pole of the cover plate, and the negative pole is connected to the negative pole of the cover plate;

[0014] A heating plate is attached to the side of the lithium battery cell;

[0015] A temperature sensor 1, mounted on the surface of the lithium battery cell, for monitoring the temperature of the lithium battery cell;

[0016] a second temperature sensor, mounted on the heating plate, for monitoring the temperature of the heating plate;

[0017] Relay 1, the normally closed end of relay 1 is connected to the charging MOS control terminal pad of the BMS battery protection board;

[0018] Relay 2, the normally open end of relay 2 is connected to the power supply line of the heating plate.

[0019] Preferably, a forced start button is provided on the cover plate, and the forced start button is connected to the forced start button pad of the BMS battery protection board.

[0020] Preferably, a power meter is installed on the cover plate, and the power meter is connected to the positive electrode column and the negative electrode column of the battery.

[0021] Preferably, the support frame includes a base and side panels, the side panels are fixedly mounted on both sides of the base, and a plurality of lithium batteries are placed on the base and located between the two side panels.

[0022] Preferably, a shell is further provided on the outer side of the support frame, and the shell wraps the support frame and the plurality of lithium batteries inside.

[0023] Preferably, the supercapacitor group is a structure in which multiple capacitors are connected in series.

[0024] Preferably, a capacitor box is provided on the outside of the supercapacitor group, and the capacitor box is fixedly connected to the partition.

[0025] Preferably, the lithium battery cell shells are also filled with thermal insulation cotton.

[0026] Preferably, it also includes a BMS battery protection plate, which is fixedly installed on the upper end surface of the partition, the negative electrode of the battery cell is connected to the negative electrode of the BMS battery protection plate, and the total negative electrode of the BMS battery protection plate is connected to the negative electrode column of the cover plate.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] The utility model connects a supercapacitor group in parallel between the positive and negative terminals on the lithium battery. As the voltage of the generator fluctuates, or when the lithium battery is powered off for protection, the supercapacitor group will charge and discharge, generating corresponding charge and discharge currents. At this time, the vehicle's battery current sensor can detect normal current and will not report a battery fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0030] Figure 2 This is a structural diagram of the bracket, partition and capacitor of the utility model;

[0031] Figure 3 This is a structural diagram of the bracket, partition and capacitor box of the utility model;

[0032] Figure 4 This is a structural diagram of the lithium battery cell and support frame of the utility model;

[0033] Figure 5 This is a structural diagram of the support frame of the utility model;

[0034] Figure 6 This is a structural diagram of the heating control panel of the utility model;

[0035] Figure 7 This is the structural diagram of the BMS battery protection board of the utility model;

[0036] Figure 8 It is a top view of the thermal insulation cotton and shell of the utility model.

[0037] In the figure: 1. Lithium battery cell; 2. Support frame; 21. Base; 22. Side panel; 3. Partition; 4. Cover; 41. Force start button; 42. Power button; 5. Heating plate; 6. Housing; 7. Supercapacitor pack; 8. Capacitor box; 9. Insulation cotton. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] See also Figure 1-8 This embodiment provides a lithium battery system including multiple lithium battery cells 1, a support frame 2, and a housing 6. The support frame 2 is located outside the multiple lithium battery cells 1 and encapsulates the lithium battery cells inside the support frame 2. The positive electrodes of the multiple lithium battery cells 1 are welded together and extend upward to form the positive electrode of the battery cell. The negative electrodes of the multiple lithium battery cells 1 are welded together and extend upward to form the negative electrode of the battery cell.

[0040] In this embodiment, the support frame 2 includes a base 21. The base 21 is made of aluminum alloy or stainless steel and has high strength. Since lithium batteries are relatively heavy, it can provide better support for the lithium battery 1. Side plates 22 are fixed to both sides of the base 21 by bolts. Bolt holes are provided at the bottom of the side plates 22. Bolts can be used to fix the bracket and lithium battery to the frame of the car. Figure 2-Figure 3 As shown, multiple lithium battery cells 1 are placed side by side on the base 21 and located between the two side panels 22. The support frame 2 can improve the stability of the lithium battery during installation, ensure that the lithium battery is installed more firmly, reduce the vibration of the lithium battery, and also reduce the collision to the lithium battery.

[0041] A partition 3 is also installed on the upper side of the two side panels 22 by bolts. A through hole is opened on the partition 3. The positive electrode and the negative electrode of the lithium battery cell 1 extend from the through hole to the upper side of the partition 3, and a mounting portion is formed on the upper side of the partition 3.

[0042] The upper end surface of the partition 3 is fixed with a capacitor box 8 by bolts, and a supercapacitor group 7 is placed inside the capacitor box 8. The capacitor box 8 wraps the supercapacitor group 7 and protects the supercapacitor group 7 inside, which can prevent the supercapacitor group 7 from being hit. In this embodiment, the supercapacitor group 7 is a structure of 6 supercapacitors connected in series. The supercapacitor used is 16.2V and has a capacitance value of 6F-85F. In actual use, the number and capacitance of the supercapacitors can also be other styles, which are specifically set according to the actual product. The partition 3 separates the lithium battery cell 1 and the supercapacitor group 7, so that the lithium battery cell 1 and the supercapacitor group 7 are located in different chambers, which is safer when the lithium battery is working.

[0043] In this embodiment, a cover plate 4 is further provided above the partition 3. The cover plate 4 is fixedly connected to the housing 6 by bolts. A positive pole and a negative pole are fixedly mounted on the cover plate 4. A BMS battery protection plate is further provided between the partition 3 and the cover plate 4. The BMS battery protection plate is fixedly mounted on the upper end face of the partition 3. The positive pole of the cover plate 4 is connected to the positive pole of the lithium battery cell, the negative pole of the lithium battery cell is connected to the negative end of the BMS battery protection plate, and the total negative end of the BMS battery protection plate is connected to the negative pole of the cover plate 4. The BMS battery protection plate is prior art and will not be described in detail here. The positive pole of the supercapacitor group 7 is connected to the positive pole of the cover plate 4, and the negative pole of the supercapacitor group 7 is connected to the negative pole of the cover plate 4.

[0044] One of the applicant's objectives in installing a supercapacitor bank is to shut down the charging MOSFET on the BMS battery protection board when the ambient temperature drops below 0 degrees Celsius and the heating function is turned on. However, due to the temporary shutdown of the charging function, vehicles equipped with battery current detection will be unable to monitor the battery current and will report a battery failure. By connecting a supercapacitor bank in parallel between the battery's positive and negative terminals, the bank charges and discharges as the generator voltage fluctuates, generating corresponding charge and discharge currents. At this point, the vehicle's battery current sensor will detect normal current and will not report a battery failure. This solves the problem of vehicles displaying a battery failure indicator when there is no current after lithium battery protection.

[0045] When testing lithium batteries, the applicant also discovered that when lithium batteries are used in cold weather, such as in large areas such as Central China, North China, and Northeast China, the temperature often drops below 0 degrees Celsius in winter. Due to the characteristics of lithium batteries themselves, charging lithium batteries below 0 degrees Celsius increases the risk of lithium deposition in the battery cells. During the charging process, lithium ions escape from the positive electrode and migrate to the negative electrode, depositing and forming dendritic metallic lithium on the surface of the negative electrode, forming lithium dendrites on the surface of the negative electrode of the battery. Lithium dendrites can affect the service life of the battery and, in severe cases, can cause the battery to spontaneously ignite or explode (if too many lithium dendrites penetrate the diaphragm inside the battery, they can cause direct contact between the positive and negative electrodes, thereby causing an internal short circuit. This not only reduces the performance of the battery, but can also cause serious consequences such as spontaneous combustion or explosion of the battery). For example, when lithium batteries are used as power sources for automobiles, electric vehicles, or electric bicycles, if they are charged in cold weather, the above problems will occur. Especially when used as a starting power source for a car, once the car's engine starts, it will drive the car's generator to work, and the generator will immediately charge the lithium battery. The risk of using lithium batteries in cars is very high.

[0046] To address the above issues, heating sheets 5 are fixedly mounted on the outside and bottom of the multiple lithium battery cells 1 to heat the lithium battery cells 1. In this embodiment, the heating sheets 5 are glued to the side walls of the lithium battery cells 1, wrapping the lithium battery cells to improve the heating effect on the lithium battery cells.

[0047] A heating control board is also fixedly installed on the partition 3. The main control of the heating control board adopts the STM32F103C8T6 single-chip microcomputer, which is the existing technology and will not be described here. The positive pole of the heating control board is connected to the positive pole column of the cover plate 4, and the negative pole of the heating control board is connected to the negative pole column of the cover plate 4. The heating control board is used to control the heating work of the heating plate 5. There are multiple heating plates 5 on the surface of the lithium battery cell, and the specific number is set according to actual usage requirements.

[0048] The working temperature of the heating plate 5 is set to 0 degrees. When the temperature is lower than 0 degrees Celsius, the heating plate 5 is powered on to heat the lithium battery. When the temperature is lower than 0 degrees, the lithium battery can be heated. Figure 1 As shown, the outer shell 6 is located on the outside of the support frame 2, wrapping the lithium battery cell 1 inside it, serving as the outermost protective shell to provide preliminary protection for the lithium battery cell. The support frame 2 is located between the outer shell 6 and the lithium battery cell 1, and is bonded to the lithium battery cell 1, providing secondary protection for the lithium battery cell 1. Moreover, the support frame 2 is made of aluminum alloy or stainless steel, which can improve the strength of the entire battery. In addition, the heating plate 5 is also located between the outer shell 6 and the lithium battery cell 1, in a nearly closed space, which can improve the heating effect on the lithium battery cell and prevent heat from dissipating.

[0049] In a further embodiment, an NTC temperature sensor 1 is installed on the surface of the heating plate 5, and the NTC temperature sensor 1 is used to monitor the temperature of the heating plate 5 to avoid the situation where the temperature of the heating plate is too high; an NTC temperature sensor 2 is installed on the surface of the lithium battery cell 1, and the NTC temperature sensor 2 is used to monitor the temperature of the lithium battery cell 1.

[0050] In this embodiment, two relays are also provided on the heating control board, namely relay 1 and relay 2. Relay 1 of the heating control board is normally closed and connected to the charging MOS control terminal pad on the BMS battery protection board, and relay 2 is normally open and connected to the power supply line of the heating plate 5.

[0051] Relays 1 and 2 are closed by default when powered on. When NTC temperature sensor 2 detects that the temperature is lower than or equal to the set temperature (default 0 degrees Celsius) and higher than the set voltage (default 14V), Relays 1 and 2 are turned on. When NTC temperature sensor 2 detects that the temperature is higher than the set temperature (1 degree Celsius), the set delay value is entered. When the delay time expires, Relays 1 and 2 are turned off. The delay is set during circuit design to prevent frequent relay operation caused by detection fluctuations. The delay time can be set according to actual usage requirements.

[0052] The following is a detailed description of the logical relationship between the relay and the NTC temperature sensor. The set NTC temperature sensor 1 is responsible for detecting the temperature of the heating plate. When it is greater than or equal to the set temperature value (the default temperature is 80 degrees Celsius), the switch of relay 2 is turned off. When the temperature is lower than the set temperature value, and whether condition 1 is in the state where the switch needs to be turned on, if condition 1 still reaches the state of turning on the switch, the switch is turned on. If condition 1 does not reach the state of turning on the switch, the switch is turned off.

[0053] In this embodiment, to prevent thermal runaway of the heater, an NTC temperature sensor monitors the heater's temperature. When the temperature exceeds a set safety threshold, it shuts off the heater's power supply. Each heater also features an independent over-temperature protection switch, providing dual protection. In this embodiment, the temperature control switch is a KSD9700 model, but other models can be selected based on actual needs, as long as they can achieve temperature control. This is not a limitation here.

[0054] In this embodiment, when the temperature is below 0 degrees and the voltage is above 14V, the combination logic confirms that the ambient temperature is below 0 degrees and the car generator starts working and outputs current, and the battery is in charging mode. After the conditions are met, the heating control board will turn on two relay switches. Relay 1 is the normally closed end that controls the charging MOSFET of the protection board. When relay 1 is opened, the normally closed end is disconnected, the charging MOSFET of the battery protection board is turned off, and the battery stops charging. Relay 2 is the normally open end that controls the power supply of the heating plate. When relay 2 is opened, the normally open end is closed, the power supply of the heating plate is energized, and heating begins. The above control can prevent the vehicle from turning on the heating plate when the engine is turned off, causing the battery to run out of power and unable to start the vehicle. The heating plate will only be turned on in the high voltage state after the generator is running, and the electricity output by the generator will be used to drive the heating plate to work. At the same time, the battery charging MOSFET will be turned off to prevent the lithium battery from being damaged and dangerous when charging at low temperatures. That is to say, when the battery voltage is low (i.e., lower than the set 14V), there will be a priority mechanism for the purpose of starting the car first. After the car is started, the car's generator does not charge the lithium battery. The electricity output by the generator is used to heat the heating plate 5. At this time, the charging MOSFET of the lithium battery is turned off and the lithium battery is in an uncharged state. This can protect the lithium battery in low temperature conditions while ensuring the normal start of the car. When the temperature is higher than the set temperature (0 degrees), after a delay, relay 1 and relay 2 are simultaneously closed, cutting off the power supply to the battery heating plate and turning on the charging MOSFET. The battery can be charged normally through the generator, avoiding the risk of damage to the lithium battery caused by low-temperature charging.

[0055] The applicant's second purpose in installing a supercapacitor bank is to address the situation where lithium batteries cannot be charged below 0 degrees Celsius. When the lithium battery cannot be charged (i.e., in a protection state), the power output by the generator cannot enter the battery, which will cause voltage fluctuations. The vehicle system will report a fault because it cannot detect the charging current. Therefore, adding a supercapacitor to the front end of the protection board can prevent voltage fluctuations and system failures caused by BMS protection. When the generator voltage drops back to normal, the charging MOSFET will automatically turn on and conduct the charging current. When the lithium battery is in a low-temperature environment, it can ensure normal heating of the lithium battery while preventing the vehicle system from reporting a current fault.

[0056] The third purpose of the applicant in setting up a supercapacitor group is to strictly control the upper charging voltage limit of lithium batteries to ensure safety. To protect lithium batteries from overcharging, lithium batteries must use a BMS battery protection board to control the maximum voltage. Under certain vehicle operating conditions, the generator voltage may occasionally exceed the upper charging voltage limit of the lithium battery. When the voltage exceeds the upper limit, the BMS battery protection board will actively shut down the charging MOSFET and cut off the charging current. Therefore, in the protection state, the power output by the generator cannot enter the battery, which will cause voltage fluctuations. The vehicle system will report a fault due to the inability to detect the charging current. Therefore, adding a supercapacitor to the front end of the protection board can prevent voltage fluctuations and system failures caused by BMS protection. When the generator voltage drops back to normal, the charging MOSFET will automatically turn on to conduct the charging current.

[0057] During the protection period, due to the temporary shutdown of the charging function, vehicles equipped with battery current detection will be unable to monitor the battery current and will report a battery fault. A supercapacitor bank is connected in parallel between the positive and negative battery terminals. As the generator voltage fluctuates, the supercapacitor bank charges and discharges, generating corresponding charge and discharge currents. At this time, the vehicle's battery current sensor will detect normal current and will not report a battery fault.

[0058] Furthermore, when the lithium battery cannot be charged after the charging protection is activated, the surge caused by the generator voltage exceeding the lithium battery voltage can cause the instrument lights to flicker. Here, the supercapacitor pack also provides voltage stabilization. By utilizing the supercapacitor's rapid charge and discharge characteristics, when used in conjunction with a battery, it can extend battery life and enhance instantaneous pulse power, improving vehicle performance.

[0059] However, during the applicant's actual testing of lithium batteries, it was discovered that in the summer, due to the sun's scorching heat, the temperature inside the car's engine compartment was too high, and the heat was transferred to the inside of the battery, triggering the over-temperature protection function of the BMS battery protection board. The BMS battery protection board overheat protection was turned off, causing the battery to go offline. At this time, the power and current temporarily stored in the added supercapacitor pack can be detected by the car's computer system, and the alarm of battery offline failure will not be given. In order to avoid the over-temperature protection function being triggered due to the heat problem, the applicant filled a layer of heat insulation cotton 9 between the shell 6 and the lithium battery cell 1, such as Figure 8As shown, the thermal insulation cotton 9 is made of glass fiber or aluminum silicate ceramic fiber. When the weather is hot in the summer, the thermal insulation cotton can isolate the external high temperature and prevent heat from being transferred to the lithium battery. According to the applicant's experiments, although lithium batteries will also self-heat in the summer, the heat generated by self-heating is far less than the temperature of heat transfer after exposure to the summer sun. Therefore, adding thermal insulation cotton does not affect the normal use of lithium batteries, and there is no need to worry about the problem of lithium battery self-heating. Moreover, lithium batteries self-heat relatively slowly. The applicant conducted a continuous vehicle test for 6-8 hours and found that the temperature rise of lithium batteries was significantly lower than the temperature in the engine compartment. In addition, when the weather is cold, the lithium battery heating insulation cotton also has the function of heat preservation.

[0060] In a further embodiment, a forced start button 41 is further provided on the cover plate 4, and the forced start button 41 is connected to the forced start button pad of the BMS battery protection board. In addition to the charging protection function, the lithium battery protection board also has a discharge protection function. When the battery cell voltage is lower than the lower discharge limit voltage of the lithium-ion cell, the protection board will shut off the discharge MOSFET, cutting off the discharge current to protect the cell from excessive discharge.

[0061] The discharge protection function promptly shuts off the battery's output current in the event of a vehicle leakage or long-term storage. When the battery is in the discharge protection state, the vehicle is without power. Traditional lead-acid batteries require a jump-start or battery charging. For lithium batteries with a forced start function, simply press the forced start switch button. The protection board will release the discharge protection within a short time (default 1 minute), temporarily opening the discharge MOSFET and conducting the battery's discharge current for emergency vehicle starting. If the vehicle is not started within 1 minute after pressing the forced start button, the protection board will again close the discharge MOSFET, and the battery will enter discharge protection mode to protect the battery and maintain its charge.

[0062] The forced start function of this product can be activated by the forced start button 41 on the battery cover, or it can be turned on by wireless remote control using a mobile phone via Bluetooth connection.

[0063] A power meter and a power button 42 are fixedly mounted on the cover 4. The negative terminal of the power meter is connected to the negative terminal of the battery, the positive terminal of the power meter is connected to pin 1 of the power button 42, and pin 2 of the power button 42 is connected to the positive terminal (not shown in the figure). Pressing the power button 42 can be used to display the power level of the lithium battery.

[0064] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery system, characterized in that: include: A plurality of lithium battery cells (1) and a support frame (2), wherein the plurality of lithium battery cells (1) are placed on the support frame (2), and the positive and negative electrodes of the plurality of lithium battery cells (1) are welded together to form a battery cell positive electrode and a battery cell negative electrode; A separator (3) is fixed on the top of the support frame (2), and the positive electrode and the negative electrode of the battery cell extend from the upper end of the separator (3); A cover plate (4) is located above the partition plate (3), and a positive electrode column and a negative electrode column are fixedly mounted on the cover plate (4); The supercapacitor group (7) is fixed on the partition (3), the positive electrode of the supercapacitor group (7) is connected to the positive electrode column of the battery, and the negative electrode is connected to the negative electrode column of the battery. When the charging of the lithium battery is turned off, the supercapacitor group will charge and discharge as the voltage of the generator fluctuates, generating normal charge and discharge current.

2. A lithium battery system according to claim 1, characterized in that: Also includes A heating control plate is fixed on the partition (3), wherein the positive electrode of the heating control plate is connected to the positive pole of the cover plate (4), and the negative pole is connected to the negative pole of the cover plate (4); A heating plate (5) is attached to the side of the lithium battery cell (1); A first temperature sensor, mounted on the surface of the lithium battery cell (1), for monitoring the temperature of the lithium battery cell (1); a second temperature sensor, mounted on the heating plate (5) and used for monitoring the temperature of the heating plate (5); Relay 1, the normally closed end of relay 1 is connected to the charging MOS control terminal pad of the BMS battery protection board; Relay 2, the normally open end of relay 2 is connected to the power supply line of the heating plate (5).

3. A lithium battery system according to claim 2, characterized in that: The cover plate (4) is provided with a forced start button, which is connected to the forced start button pad of the BMS battery protection board.

4. A lithium battery system according to claim 2, characterized in that: An electricity meter is installed on the cover plate (4), and the electricity meter is connected to the positive pole and the negative pole of the battery.

5. The lithium battery system according to claim 3, characterized in that: The support frame (2) comprises a base (21) and side panels (22), wherein the side panels (22) are fixedly mounted on both sides of the base (21), and a plurality of lithium battery cells (1) are placed on the base (21) and located between the two side panels (22).

6. A lithium battery system according to claim 4, characterized in that: An outer shell (6) is also provided on the outer side of the support frame (2), and the outer shell (6) wraps the support frame (2) and the plurality of lithium battery cells (1) inside.

7. The lithium battery system according to claim 2, characterized in that: The supercapacitor group (7) is a structure in which multiple capacitors are connected in series.

8. The lithium battery system according to claim 2, characterized in that: A capacitor box (8) is provided outside the supercapacitor group (7), and the capacitor box (8) is fixedly connected to the partition (3).

9. The lithium battery system according to claim 6, characterized in that: The lithium battery cell (1) housing (6) is also filled with thermal insulation cotton.

10. The lithium battery system according to claim 1, characterized in that: It also includes a BMS battery protection plate, which is fixedly mounted on the upper end surface of the partition (3), the negative electrode of the battery cell is connected to the negative electrode of the battery cell of the BMS battery protection plate, and the total negative electrode of the BMS battery protection plate is connected to the negative electrode column of the cover plate (4).

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